壳聚糖（CS）修饰铂装饰铈（Pt-CeO2-CS）复合材料的光电和光催化研究

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2024-11-01 DOI:10.1016/j.optmat.2024.116376

Safoora Shabbir , Rabia Naeem , Tehmeena Ishaq , Muhammad Adil Mansoor , Saba Afzal , Fatima Hassan

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引用次数: 0

摘要

本文通过化学还原法和溶胶-凝胶法合成了新型三元铂-二氧化铈-壳聚糖（Pt-CeO2/CS）复合材料，以及二元铂-壳聚糖（Pt/CS）和二氧化铈-壳聚糖（CeO2/CS）复合材料，对其甲基橙（MO）的光降解和光电化学（PEC）活性进行了比较研究。使用傅立叶变换红外光谱法（FTIR）、热重法（TG）、场发射扫描电子显微镜（FESEM）以及电子衍射光谱法（EDS）、X 射线衍射法（XRD）、X 射线光电子法（XPS）、紫外可见光法（UV-Vis）、光致发光法（PL）和拉曼光谱法研究了复合材料的结构、热、形态和光学特性。紫外-可见带隙分析表明，带隙值 Eg 值（2.7eV）的降低增加了光吸收特性。合成的 Pt-CeO2/CS 三元复合材料可作为染料脱色的光催化剂，在光照射下，λmax 为 464 纳米时，甲基橙（MO）的脱色率最高可达 84%。研究发现，三元复合材料的动力学遵循伪一阶，速率常数为 0.01279 min-1。此外，与二元 CeO2/CS 和 Pt/CS 复合材料相比，Pt-CeO2/CS 混合复合材料的光电化学性能提高了 1.3 ∼ 2.5 倍（0.67 V 时为 1.8 mA/cm2 ，与 Ag/AgCl 相比）。Pt-CeO2/CS 中电荷转移过程的增强可能是 MO 染料光降解增强和 PEC 水分离性能提高的原因。

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Optoelectronic and Photocatalytic investigations of chitosan (CS) modified Platinum decorated ceria (Pt-CeO2-CS) composite

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Optoelectronic and Photocatalytic investigations of chitosan (CS) modified Platinum decorated ceria (Pt-CeO2-CS) composite

Herein, a comparative study is performed to evaluate the Photodegradation of Methyl Orange (MO) and Photoelectrochemical (PEC) activities of novel ternary Pt–CeO₂/Chitosan (Pt–CeO₂/CS), and binary Pt/Chitosan (Pt/CS) and CeO₂/Chitosan (CeO₂/CS) composites synthesized via the chemical reduction and sol-gel methods. The structural, thermal, morphological, and optical characteristics of composite were examined using Fourier Transform Infra-Red (FTIR) Spectroscopy, Thermogravimetry (TG), Field Emission Scanning Electron Microscopy (FESEM) coupled with Electron Diffraction Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray Photoelectron (XPS), UV–visible (UV–Vis), photoluminescence (PL) and Raman Spectroscopy. The UV–vis band gap analysis revealed that the reduction in the bandgap value E_g value (2.7eV) increases the light absorption property. The as synthesized ternary Pt–CeO₂/CS composite acts as a photocatalyst for dye decolourisation, with a maximum of 84 % of methyl orange (MO) decolourisation at λ_max of 464 nm under light irradiation. The kinetics of ternary composite was found to follow pseudo-first-order with rate constant of 0.01279 min⁻¹. Moreover, the photoelectrochemical performance of Pt–CeO₂/CS hybrid composite with 1.3 ∼ 2.5-fold higher value of current density (1.8 mA/cm² at 0.67 V vs. Ag/AgCl) is attained as compared to binary CeO₂/CS and Pt/CS composites. The probable enhanced charge transfer process in Pt–CeO₂/CS has been proposed responsible for the enhanced photodegradation of MO dye and improved PEC water splitting performance.

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.